PHYSIOGRAPHY. 



Strontianite. 



213 



Fig. 424. 



Schoharie, (N. Y.) 



M on h - 

 e 1 on el - 

 el on e2 - 

 h on cl - 

 h on c2 - 

 cl on c2 - 



121 30' PHILLIPS. 



108 12 " 



144 20 " 



126 

 143 

 160 



5 



30 

 35 



Cleavage, parallel with M rather perfect ; with c less ea- 

 sily obtained, faint traces observable in the direction A, or 

 at least, small conchoidal fracture. Fracture in other di- 

 rections, uneven. Surface P often rough, though even, 

 and streaked, parallel to the edges of combination with c. 

 M deeply streaked in a horizontal direction, and hence the 

 crystals often in curved, barrel-shaped, prisms. The other 

 planes generally smooth. 



Lustre vitreous, slightly inclining to resinous upon the 

 uneven faces of fracture. Color asparagus-green, and ap- 

 ple-green ; pale yellowish-brown, yellow and grey ; white. 

 Streak white. Transparent . . . translucent. 



Brittle. Hardness =3-5. Sp. gr. =3-605, the variety 

 in acicular crystals from Braunsdorf, near Frieberg. 



Compound Varieties. Twin-crystals : axis of revolu- 

 tion perpendicular, face of composition parallel to a face of 

 M. The individuals generally continued beyond the face 



